/apps/twnlua: add ---@meta annotation

apps/twnlua/docgen.py

@@ -29,8 +29,8 @@ def to_lua_type_annot(typedesc):
         return "unknown"
         # raise BaseException("Unhandled type for annotation: %s" % typedesc)
 
+print("---@meta twn")
 print("---@diagnostic disable")
-print("error(\"townengine lua api file is not supposed to be imported!\")")
 
 type_annotations = {}
 type_annotations["ctx"] = r"{ %s, udata: table }" % \